As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTING SYSTEM OPERATIONAL CHECK {B737-33-3-0235} - FOUND SEATS 15 ABC, 20ABC, AND 21ABC AISLE SIDE RED EMERGENCY TRACKING LIGHTS INOP DURING TEST. REPLACED M1694 BATTERY PACK AND POWER SUPPLY IAW AMM 33-51-06. EMERGENCY LIGHTS TEST GOOD.